Rotating and feeding mechanism for drill-bars.



L. C'. HARDSOCG. ROTATING AND PEEDING MEGHANISM FOR DRILL BARS.

APPLICATION FILED JUNE 17, 1909.

1,020,908, Patnted Mar. 19, 1912.

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L. d. HARDsooG.

ROTATING AND FEEDING MBGHANISM FOR DRILL BARS.

APPLICATION FILED TUNE 17, 1909.

1,020,903. Patented Mar. 19, 1912.

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i 'UNITED STATES PATENT OFFICE.

LESTER C. HARDSOCG, 0F OTT'UMWA, IOWA, ASSIGNOR TO HARDSOCGMANUFACTURING COMPANY, 0F OTTUMWA, IOWA, A CORPORATION OF IOWA.

ROTATING AND FEEDING MECHANISM FOR DRILL-BARS.

To all whom may concern Be it known that I, Lns'rnn C. HAIcDsoeo, acitizen of the United States, residing at lOttumwa, in the county ofWapello and State of Iowa, have invented new and useful Improvement-s inRotating and Feeding Mechanisms for Drill-Bars, of which the followingis a specification.

This invention relates to new and useful improvements in rotating andfeeding mechanisms for the drill bars of coal and rock drilling machinesand it relates more particularly to a structure of the type shown inPatent No. 484,425, granted October 18, 1892, to Martin Hardsocg. Thistype of structure embraces two essential elements, a gear frame and athreaded boxing to receive the drill or feed bar.

The object of the present invention is to provide a novel means forholding these elements in their assembled relation toward the ends ofovercoming all loose play, of providing for the quick and easyconnection or disconnection of the elements, and of providing for thereversal of the boxing.

Toward the accomplishment of the objects stated, the invention proposesnovel means to couple the boxing and the gear frame and of a nature toprevent any relative axial or turning movement thereof, and also a novelarrangement of the coupling parts whereby either end of the boxing maybe fitted into the socket of the gear frame and the boxing effectivelycoupled to the gear frame in the advantageous manner generally statedabove.

In the accompanying drawings I have illustrated a preferred andadvantageous embodiment of the invention.

In the said drawings: Figure 1 is a plan view of a drill bar rotatingand feeding mechanism in accordance wit-h the present invention. Fig. 2is a detail perspective view of the gear frame in the disconnectedrelation thereof. Fig. 3 is a similar View of the threaded boxing whichreceives the feed or drill bar. Fig. 4 is a similar view of a lockingkey for maintaining the closed relation of the sect-ions of the boxing.Fig. 5 is a side elevation, partly in section, of the device as anentirety, and Fig. 6 is a cross section thereof taken centrally throughthe boxing.

Specification of Letters Patent.

Application filed June 17, 1909.

Patented Mar. 19, 1912.

Serial No. 502,783.

Similar' characters of reference designate corresponding partsthroughout the several views.

The gear frame to which reference has been made includes two tubularbearing members l and 2 which extend at right angles to one another andare connected by a curved arm 3. The member 1 is located in advance ofthe member 2 and forms the support for a driving shaft 4, having asquared outer end portion, as 5, to receive a crank handle and havingsecured to its inner end portion a bevel pinion, as G. The latter mesheswith, drives, and retains in position, a larger bevel pinion, as 7, thehollow hub 8 of which is fitted in the bearing member 2, abuts againstan internal annular rib, as 9, circumscribing the bore of said bearingmember, and is provided with an internal longitudinal rib, as 10, forengagement in the usual longitudinal groove provided in the threadedportion of the drill or feed. bar, to couple said pinion and said barand thereby cause the rotation of the latter by and with the former.

The socket to which reference has been made, is designated by thenumeral 11 and is an axial continuation of the bearing member 2, beingthat portion of said member which projects in the rear of the rib 9. Thesocket 11 is provided at its rear end with oppositely locatedextensions, as 12 and 13, each having a longitudinal tapered openingtherein and the extension 12 having at its upper side a rearwardlyprojecting lug, as 14, which terminates in an overhanging bill, theprovision of which affords an undercut recess, as 15, for a purpose tobe later set forth.

The threaded boxing to which reference has been made, includes an uppersection, as 16, and a lower section, as 17, these sections beinghingedly united by a knuckle `ioint coupling, as 18. The sections, intheir closed relation, as shown in Fig. 3, have the usual threaded borethrough which the drill or feed bar extends and by which the axialadvance or withdrawal of said bar is effected. The sections have smoothsurfaced extensions, as 19, at each end thereof, which are fitted intothe socket 11, as shown in Figs. 1 and 5 and abut against the rib 9.

The section 16 is provided with the laterally projecting trunnions 21,by means of which the device may be pivoted for vertical movement to asupporting post of any desired construct-ion. Said section 16 has at itsside opposite the knuckle joint 18, a pair of tangentially dependingextensions, as 22, each having a longitudinal opening therethrough andbeing located at some dist-ance from the adjacent trunnion 21 and oneach side thereof. rlhe openings in the extensions 22 are alined Withone another and also with the opening in the extension 12 or 13, as thecase may be, in accordance With which end of the boxing is fitted intothe socket. Between the extensions 22 and the adjacent trunnion 21,transverse recesses, as 23, occur, in Which are received tongues, as241, that project laterally from the corresponding side of the section17. The tongues 24 are held in the recesses 23 by a locking key, as 25,which has a tapered end, as 26, and Which is inserted through thealining openings in the extensions 22 and 12 or 13, as the case may be.The key 25 not only holds the sections against coming open but itprevents any relative turning movement of the gear frame and the boxing.Relative axial movement of these parts is prevented by either one of thelugs 27 and 28, Which are engaged in the recess 15. The lug 27 isprovided at the upper side of the for- Wardly located extension 22 andengages in the recess 15 when the parts are. so positioned that the key25 may be inserted into the opening in the extension 12. The lug 28 isprovided at the upper side of the rear- Wardly-located knuckle of thejoint 18 and engages in the recess 15 when the parts are so positionedthat the key 25 may be inserted into the opening in the extension 13.

The tapered end 26 of the key 25 has a Wedge-like engagement in theopenings of either of the extensions 12 or 13 Which assures of the firmretention of the key in its locking position against accidentaldisplacement which might otherwise be an incident of vibration or Wear.The tongues 24 also serve as a means to hold the sections 16 and 17against axial play with respect to one another in case the knuckle jointshould become loose or Worn, and for the same purpose, the section 16 isprovided at its opposite sides with raised lugs 29 and 30, the lug 29fitting bet-Ween t-he tongues 24 and the lug 30 fitting into a recess 31formed in the section 17.

In use, the sections of the boxing are closed and one end of the boxingis fitted into the socket 11, at which time the boxing is turned so asto bring either of its lugs 27 or 28 into the recess 15. The key 25 isthen inserted through the alining openings in the manner explained. Thekey serves to prevent any relative turning of the parts; the engagementof the lug 27 or 28 in the recess 15 prevents any axial movementthereof; and the fitting of the extended end portions 19 into the socketserves to prevent any loose play or spreading of the sections of theboxing.

Having fully described my invention, I claim:

1. In a rotating and feeding mechanism for drill bars, the combinationWith a gear carrying member and a threaded boxing con-y stitutingcompanion elements and adapted for telescoping association, the boxingcomprising hingedly connected half sections, of apertured extensionsprovided on the elements and arranged to be brought into aliningrelation, a longitudinally disposed and movable locking key forinsertion through the extensions, the key serving to hold the companionelements against relative turning movement and also to hold the halfsections of the boxing in closed relation, and means for holding thecompanion elements against relative axial movement, the companionelements being adapted by relative partial rotation to provide for theoperation of the means and to bring the apertured extensions intoalinement.

2. In a rotating and Jfeeding mechanism for drill bars, the combinationwith a gear carrying member and a threaded boxing constituting companionelements and adapted for telescoping association, the boxing comprisinghingedly connected half sections, of apertured extensions provided onthe elements and arranged to be brought into alining relation, alongitudinally disposed and movable locking key for insertion throughthe extensions, the key serving to hold the companion elements againstrelative turning movement and also to hold the half sections of theboxing in closed re lation, a recessed lug provided on one of theelements and a lug provided on the other element for engagement in therecess of the first lug When the extensions are in alining relation tothereby hold the elements against relative axial movement.

3. In a rotating and feeding mechanism for drill bars, the combinationWith a socket and a threaded boxing constituting companion elements, theboxing comprising hingedly connected half sections and beingtelescopically fitted into the socket, of apertured extensions providedon the elements and arranged to be brought into alining relation, and alongitudinally disposed and movable locking key for insertion throughthe extensions, the key serving to hold the I movement of the elementssuch as brings the to be alined with either of the extensions on thesocket, and a longitudinally disposed and movable locking key forinsertion through the extensions on the boxing and that particularextension on the socket which is alined with the extensions on theboxing, the key serving to hold the companion elements against relativeturning movement and also to hold the half sections of the boxing inclosed relation, the socket having an overhanging recessed lug and theboxing having a pair of lugs located at opposite sides and ends thereofand either of which, in accordance With which end of the boxing isiitted in the socket, may be engaged in the recess of the first lug, tothereby hold the companion elements against relative axial movement.

5. In a rotating and feeding mechanism for drill bars, in combination, agear carrying member and a threaded boxing constituting companionelements, the boxing comprising hingedly connected half sections andbeing adapted for telescoping associa- A longitudinally disposed andmovable lock-V ing key for insertion through the alining extensions, thekey serving to hold the companion elements against relative turningmovement and also to hold the half sections of the boxing in closedrelation, one of the companion elements having a single lug and theother companion element having a pair of lugs, either of which inaccordance with which end of the boxing is associated with the gearcarrying member is adapted for coperation with the firstnamed lug whenthe extensions of one element are alined with either of the extensionsof the other element to thereby hold the elements against relative axialmovement.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

LESTER C. HARDSOCG.

Witnesses T. K. HARLAN, CHARLES STERN.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

